<!doctype html> 
<html> 
<head> 
    <meta charset="utf-8"> 
    <title></title> 
</head>
<body>

<script type="text/javascript">
	
	function a(){ return 15};
	//如果直接执行变量名，会返回自己
	alert(a);
	alert(a());
</script>
</body>
</html>